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    Global warming induced hybrid rainy seasons in the Sahel

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    U16ArtSalackGlobalInthomDev.pdf (3.400Mb)
    Date
    2016-10-05
    Author
    Salack, S.
    Klein, C.
    Giannini, A.
    Sarr, B.
    Worou, O.N.
    Belko, N.
    Bliefernicht, J.
    Kunstman, H.
    Type
    Journal Article
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    The small rainfall recovery observed over the Sahel, concomitant with a regional climate warming, conceals some drought features that exacerbate food security. The new rainfall features include false start and early cessation of rainy seasons, increased frequency of intense daily rainfall, increasing number of hot nights and warm days and a decreasing trend in diurnal temperature range. Here, we explain these mixed dry/wet seasonal rainfall features which are called hybrid rainy seasons by delving into observed data consensus on the reduction in rainfall amount, its spatial coverage, timing and erratic distribution of events, and other atmospheric variables crucial in agro-climatic monitoring and seasonal forecasting. Further composite investigations of seasonal droughts, oceans warming and the regional atmospheric circulation nexus reveal that the low-to-mid-level atmospheric winds pattern, often stationary relative to either strong or neutral El-Niño-Southern-Oscillations drought patterns, associates to basin warmings in the North Atlantic and the Mediterranean Sea to trigger hybrid rainy seasons in the Sahel. More challenging to rain-fed farming systems, our results suggest that these new rainfall conditions will most likely be sustained by global warming, reshaping thereby our understanding of food insecurity in this region.
    https://dx.doi.org/10.1088/1748-9326/11/10/104008
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/1359
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1088/1748-9326/11/10/104008
    IITA Subjects
    Climate Change
    Agrovoc Terms
    Global Warming; Farming Systems; Food Security; Agroclimatic
    Regions
    Africa; East Africa; West Africa
    Countries
    Burkina Faso; Ethiopia; Niger; Nigeria; Senegal; Sudan
    Journals
    Environmental Research Letters
    Collections
    • Journal and Journal Articles4835
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